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A group of YUC genes are important for auxin biosynthesis and root development. (A) Overexpression of the YUC genes causes auxin overproduction phenotypes. (B) Simultaneous inactivation of YUC3, YUC5, YUC7, YUC8 and YUC9 leads to dramatic defects in Arabidopsis root development. The yucQ mutants develop short and agravitropic primary roots. (C). Roots of yucQ are smaller in diameter and have a smaller meristem. (D) The yucQ roots have a smaller root cap and an abnormal meristem.
